These are fantastic canteens, and are pretty old!
Made of heavy duty aluminum, and featuring a wool cover, most with belt hooks, these are perfect old-world looking canteens.
Some covers will vary in style, but most are wool and look similar to the stock photo.
One of the covers I saw was dated 1942, so there's no telling when these were made and used. From the few I inspected, the insides look fine, but some may require cleaning, as is with all surplus.